Criminal Minds, Season 1

Elle:
[regarding Cheryl, claiming that she can feel when something is wrong with her twin] You think Cheryl's a whackjob because she claims she can feel her sister's anxiety?

Morgan:
I never said whackjob.

[Reid walks in]

Reid:
Actually, there may be a physiological basis for it.

Morgan:
Don't ask.

Reid:
Reversed egg symmetry,monozygotic eggs split late between nine to twelve days, the DNA matches right down to the very last stranded code. There are sporadic documents of shared physiological pain.

Morgan:
And you believe it?

Reid:
No. I'm just saying it's possible.